remove unused fOverflowed from SkClampRange

src/effects/gradients/SkClampRange.h

Index: src/effects/gradients/SkClampRange.h
diff --git a/src/effects/gradients/SkClampRange.h b/src/effects/gradients/SkClampRange.h
index 376dc93b4bda9d88ab2fba961c357ef9f28f0777..09386d7e71bb7e9bf37c2eaede1f83885e35463f 100644
--- a/src/effects/gradients/SkClampRange.h
+++ b/src/effects/gradients/SkClampRange.h
@@ -27,7 +27,6 @@ struct SkClampRange {
     SkFixed fFx1;   // initial fx value for the fCount1 range.
                     // only valid if fCount1 > 0
     int fV0, fV1;
-    bool fOverflowed;   // true if we had to clamp due to numerical overflow
 
     void init(SkFixed fx, SkFixed dx, int count, int v0, int v1);